Andy- there is only one brake-light switch.
I replaced the brake-light switch, and the idle control switch (aka, CTP) which lives *in* the throttle lever, and I haven't received any ASR problems since (knock on Rosewood). You will need a Torx 8 bit to change out the CTP switch.
If I did, I was going to replace the neutral safety switch (lives on the side of the tranny), but I'll do that while I change motor mounts, since the engine/tranny (on a 500E) needs to be lowered to get access to the neutral safety switch.
My last thing to change will be expensive throttle actuator (fuel-injection wiring harness changed out last year by PO).
1988 360TE AMG